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#!/bin/bash
set -o errexit -o errtrace
BORG_HOST="12390@ch-s012.rsync.net"
export BORG_REPO="$BORG_HOST:repos/$(hostname)"
export BORG_PASSPHRASE="$(< ~/.borg_secret)"
export BORG_RSH="ssh -o IdentitiesOnly=yes -o ConnectionAttempts=20 \
-o ServerAliveInterval=30 -i ~/.ssh/borg_key"
export LC_COLLATE=C
SNAPSHOT_TARGET="/.snapshots/home-$(date "+%Y-%m-%dT%H:%M:%S")"
cleanup() {
cd /
sudo -n /usr/bin/backup-sudo cleanup
}
notify_user() {
if ! [ -t 1 ]; then
notify-send "$@"
fi
}
handle_failure() {
notify_user -u critical "Backup failed!"
echo "Backup failed!" >&2
cleanup
exit 2
}
trap cleanup EXIT
trap handle_failure INT TERM ERR
cleanup
backup() {
# borg's caching of 'known' files is really dumb - it takes the full
# canonical path to check if it has already seen a file. This means that the
# path of files must never change if you want fast backups.
# As symlinks won't work, we use mount(8) to ensure the paths stay the same.
sudo -n backup-sudo mount "$1"
if [ -t 1 ]; then
borg_progress="--progress"
fi
cd /backup
borg create --stats $borg_progress \
--exclude-from ~/.borg_exclude \
--timestamp . \
--show-rc \
::"$(basename "$1")" . && rc=$? || rc=$?
if [ $rc -eq 1 ]; then
# borg defines return code 1 as warning, usually permission stuff
notify_user "Warning: borgbackup returned 1. Check logs"
elif [ $rc -gt 1 ]; then
borg list | grep -q "$(basename "$1")" || handle_failure
fi
cleanup
sudo -n backup-sudo delete_snapshot "$1"
}
if [ ! -d "$SNAPSHOT_TARGET" ]; then
sudo -n backup-sudo snapshot "$SNAPSHOT_TARGET"
fi
$BORG_RSH "$BORG_HOST" -f -N || rc=$?
if [ ${rc-0} -eq 255 ]; then
notify_user "Backup: upload skipped"
echo "SSH server not reachable, skipping upload" >&2
exit 0
elif [ ${rc-0} -ne 0 ]; then
handle_failure
fi
# break locks in case the previous run was interrupted
borg break-lock
for d in /.snapshots/*/ ; do
echo "Now working on: $d"
backup "$d"
done
echo "Pruning repository."
borg prune --show-rc --list \
--keep-hourly 72 \
--keep-daily 7 \
--keep-weekly 4 \
--keep-monthly 6
echo "Backup finished."
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